Highfin zebra sole

Where they come from

Highfin zebra soles are Indo-Pacific flatfish. Think shallow coastal sand and mud, seagrass beds, and silty channels with a bit of current. They bury in soft substrate during the day and move at dusk to pick off worms and tiny crustaceans.

Setting up their tank

This is a sand-loving ambush predator. If you give them the right bottom and a chill corner, they do well. If you give them gravel and blasting flow, they sulk and starve.

• Tank size and footprint: 55 gallons minimum with a 36 x 18 in footprint or larger. Bigger footprint beats taller tanks.
• Substrate: 2-3 inches of fine, soft sand. Oolite or sugar-size aragonite is perfect. Skip crushed coral and sharp grains.
• Aquascape: Keep rock stable and raised on the glass or PVC so it cannot collapse when the fish digs. Leave open sand runways.
• Flow: Moderate with quiet zones. They like some water movement but need calm patches to hunt and rest.
• Lighting: Not picky, but they feed better under dimmer light or at dusk.
• Lid and intakes: Tight lid. Guard overflows and powerheads with sponge or cages. Flatfish can plaster themselves to intakes.
• Water: 1.023-1.026 sg, 75-79 F, pH 8.0-8.4, low nitrate. They do best in mature systems (6+ months) with a healthy pod population.

What to feed them

Feeding is the hard part. New arrivals are often rail-thin and only recognize live prey. Plan ahead so day one is not a scramble.

• Starter live foods: live salt-tolerant ghost/glass shrimp, live blackworms (rinsed well), small live mollies acclimated to marine, live mysids, amphipods from a refugium.
• Transition foods: frozen mysis, chopped raw shrimp, clam strips, squid slivers. Move the food with tongs right in front of the mouth while the fish is half-buried.
• Feeding time: Dusk or lights-out. They hunt more confidently then.
• Method: Use a shallow feeding dish pressed into the sand. It keeps food out of the substrate and lets you track intake.
• Frequency: Small meals daily at first, then 4-5x per week once weight is good. Watch the belly line; you want it gently rounded, not pinched.

How they behave and who they get along with

Calm fish, very into their personal sand patch. Not aggressive in the classic sense, but anything bite-sized that lounges on the bottom is on the menu.

• Good tankmates: peaceful midwater fish that do not hog every bite. Larger cardinals, chromis groups, fairy/flake-eating wrasses that are not hyper, tangs, bigger assessors.
• Use caution: boisterous wrasses, triggers, puffers, and large hawkfish can harass or outcompete them.
• Not safe: small gobies, tiny blennies, small dartfish, ornamental shrimp, and small crabs. They will eventually disappear.
• Soles together: Usually best kept singly. In big tanks with wide sand beds you can try a pair, but add together and watch for shoving or surface-chasing.

Breeding tips

Not something you are likely to pull off at home. They release pelagic eggs and the larvae are planktonic before settling and metamorphosing into flatfish. That phase needs specialized live foods and round-the-clock care. I have not seen a verified home success for this species.

Common problems to watch for

• Starvation: The big killer. A sunken belly and a sharp head profile mean it is not getting enough. Increase evening feeds and try live prey to kickstart appetite.
• Flukes and skin issues: Look for flashing, excess slime, or labored breathing. Prazi in QT works well. Keep sand clean to avoid bacterial sores.
• Mouth injuries: Overeager strikes on hard tongs or rock. Use soft tongs and feed over sand.
• Intake injuries: They can get stuck to strong powerheads or overflows. Use guards.
• Sand abrasions: From rough substrate. Swap to fine sand if you see scrapes or reddening.
• Water quality swings: They are sensitive after shipping. Keep salinity and temp steady and do smaller, frequent water changes rather than big swings.